Pluggable Coherent DWDM 10Gig

Fri Apr 25 22:44:08 UTC 2014

I'm trying to build "colorless" "directionless" with passive power
couplers/splitters plus EDFA. DTAG are doing it with 100G. I think it's
doable with 10G. Will see. Interesting experiment either way, right?

(I'm betting DTAG would use integrated pluggables if they could. They don't
appear to be fans of traditional systems.)

On Friday, April 25, 2014, Phil Bedard <bedard.phil at gmail.com> wrote:

> What are you trying to do?  Why do you need the receive side to be tuned
> to a specific narrowband wavelength?  Coherent doesn't really make sense
> in 10G becaue 10G long-haul is still on/off keyed and doesn't care about
> phase. Coherent detectors are needed where phase of the signal is
> important like long-haul 100G where multiple analog photonic signals are
> mixed on the transmit side.  It also requires DSPs to process the received
> information. You aren't going to put a DSP inside a SFP+ cage.  With
> CFP2/CFP4/QSFP28 the optics vendors would like people to start building
> the DSP onto line cards, whether it be a router or transport shelf,
> because there just isn't the packaging room to make it happen.
>
> Terastream today doesn't use integrated router optics, they use Cisco's
> nV-Optical solution. The connection between the router and transport shelf
> is still gray optics, but the system is managed as a single logical
> entity, with a 1:1 correlation between router port and transponder.  You
> "tune" the wavelength on the router because of the 1:1 correlation.
> Terastream just uses passive DWDM muxes/demuxes, also part of the same
> Cisco transport solution, and Cisco VOAs/amps.
>
> -Phil
>
>
>
> On 4/25/14, 2:59 PM, "Tim Durack" <tdurack at gmail.com <javascript:;>>
> wrote:
>
> >On Mon, Apr 21, 2014 at 2:42 PM, Tim Durack <tdurack at gmail.com<javascript:;>>
> wrote:
> >
> >> Anyone know if pluggable coherent DWDM 10Gig optics exist? (I'm finding
> >>no
> >> such thing.)
> >>
> >> How about narrow-band/filtered receive 10Gig optics? (Inline FBG filter
> >> receive side might be doable?)
> >>
> >> --
> >> Tim:>
> >>
> >> p.s. Before you ask, DTAG Terastream has got me thinking...
> >>
> >
> >As a follow up, there are lots of people willing to sell various flavours
> >of DWDM optics, but as I suspected, there is no such thing as a
> >coherent/tuned/filtered receive 10GigE DWDM optic. All 10GigE optics are
> >wide-band receive. However, you can get inline optical filters, Santec
> >OFM-15 for example. Investigating...
> >
> >--
> >Tim:>
>
>
>

-- 
Tim:>